/*
 *    Copyright 2006-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.api.dom.kotlin;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class KotlinFunction extends KotlinNamedItem {
	private final List<KotlinArg> arguments = new ArrayList<>();
	private final List<String> codeLines = new ArrayList<>();
	private final String explicitReturnType;
	private final boolean isOneLineFunction;

	private KotlinFunction(Builder builder) {
		super(builder);
		arguments.addAll(builder.arguments);
		codeLines.addAll(builder.codeLines);
		explicitReturnType = builder.explicitReturnType;
		isOneLineFunction = builder.isOneLineFunction;
	}

	public void addArgument(KotlinArg argument) {
		arguments.add(argument);
	}

	public List<KotlinArg> getArguments() {
		return arguments;
	}

	public void addCodeLine(String codeLine) {
		this.codeLines.add(codeLine);
	}

	public void addCodeLines(List<String> codeLines) {
		this.codeLines.addAll(codeLines);
	}

	public List<String> getCodeLines() {
		return codeLines;
	}

	public Optional<String> getExplicitReturnType() {
		return Optional.ofNullable(explicitReturnType);
	}

	public boolean isOneLineFunction() {
		return isOneLineFunction;
	}

	@Override
	public <R> R accept(KotlinNamedItemVisitor<R> visitor) {
		return visitor.visit(this);
	}

	public static Builder newOneLineFunction(String name) {
		return new Builder(name, true);
	}

	public static Builder newMultiLineFunction(String name) {
		return new Builder(name, false);
	}

	public static class Builder extends AbstractBuilder<Builder> {
		private final boolean isOneLineFunction;
		private final List<KotlinArg> arguments = new ArrayList<>();
		private final List<String> codeLines = new ArrayList<>();
		private String explicitReturnType;

		private Builder(String name, boolean isOneLineFunction) {
			super(name);
			this.isOneLineFunction = isOneLineFunction;
		}

		public Builder withArgument(KotlinArg argument) {
			arguments.add(argument);
			return this;
		}

		public Builder withCodeLine(String codeLine) {
			codeLines.add(codeLine);
			return this;
		}

		public Builder withExplicitReturnType(String explicitReturnType) {
			this.explicitReturnType = explicitReturnType;
			return this;
		}

		public Builder getThis() {
			return this;
		}

		public KotlinFunction build() {
			return new KotlinFunction(this);
		}
	}
}
